The Scampini Supplies Company recently purchased a new delivery truck. The new truck has an after-tax cost of $24,000, and it is expected to generate arter-tax cash fioms of 896. a. What is the truck's optimal economic life? Round your answer to the nearest whole number. vear(s) b. Would the introduction of abandonment values, in addition to operating cash flows, ever reduce the expected NpV and/or 129 of a project